I am really struggling with water quality ie RO water. I just cant keep down the ppm. See below

"I am hoping anyone can assist.

I live out in the Kruger National Park and run a huge Marine Fish Tank. The tank has been very costly and has taken about 2 years to set up. While I do everything I can the tank will just not go to the next level. On investigation it turned out its my water.

I current have 120 litres of resin to soften my water , this is then pumped by small pressure pump through 6 filters ranging from Micro filters up to carbon. The water is then pushed through 2 x RO membranes one high volume and one standard volume. The water is then sent through another 2 litres of DI resin and the final result at best is about 11pm and rises to 30ppm before I do a full back wash and flush.

My actual water is pumped from boreholes and ranges in total hardness from 1800pm up to 2300pm in the dry season.

I am desperate to resolve this problem as I have started losing some very expensive corals due to water quality.

I need my water to come out with 0ppm and climb to no higher than 5ppm. I need to produce a min of 50 litres per day but would prefer about 200 litres per day.

I was told on Friday that I should install a salt water RO membrane and unit. I need help either way, I would like to find a cost effective solution if possible."

If anyone can help and has sound knowlledge and costs I need help soon before I loose my lovely new SPS corals.

AdSGuest

I personally think there is something else wrong and that it is not the RO water. 11ppm is still quite low. If you can give a complete description of the tank plus the filtration and livestock you have I reckon the guys on here will be able to help.

Yoh, a 2000 ppm turbidity coming in is huge ! I'm in the water industry and clearly you need some sort of pre filtration before hammering your membranes like you are. I would invest in a few jojo tanks and make them into clarifiers by dosing a flocculant like aliminium sulphate to adhere to the suspended solids and skimming the surface for clarified water, then maybe passing it through a simple pool gravel filter before your existing filtration system. Hope this helps